angular6 - How to use colspan and ngFor in Angular material 6 table? - Stack Overflow
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Table] Posibility to have more rows for item with second row colspan · Issue #8332 · angular/components · GitHub
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bug(TABLE): 'sticky' directive positions column in wrong place when using more than one 'mat-header-row' on the table · Issue #22023 · angular/components · GitHub
Expandable Rows in Mat-Table programmed with Angular | Experiences of Partha Majumdar